Skip to main content

API Standard 521

API Standard 521, Pressure-Relieving and Depressurizing Systems, provides guidance, recommendations, and alternatives for the design of pressure-relieving and vapor de-pressuring systems at liquefied natural gas terminals, petrochemical facilities, gas plants, and other petroleum production facilities.

API Standard 521 is available for purchase on the API Webstore

Stay up-to-date on all API Publications like Standard 521 across an organization with API Standards Online Subscription.